EDP Sciences
Free access
Volume 416, Number 2, March III 2004
Page(s) 801 - 810
Section Atomic, molecular and nuclear data
DOI http://dx.doi.org/10.1051/0004-6361:20034602

A&A 416, 801-810 (2004)
DOI: 10.1051/0004-6361:20034602

Molecular complexes theoretical computations between methanol and carbon dioxide and their implications in the interstellar ice mantles

A. Klotz1, 2, T. Ward2 and E. Dartois3

1  Centre d'Étude Spatiale des Rayonnements, Observatoire Midi-Pyrénées (CNRS-UPS), BP 4346, 31028 Toulouse Cedex 04, France
2  Laboratoire de Physique Quantique, Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (UPS-CNRS), 118 Route de Narbonne, 31400 Toulouse, France
3  Institut d'Astrophysique Spatiale (CNRS), Orsay, France

(Received 21 May 2003 / Accepted 7 November 2003)

Theoretical computations were carried out on the molecular complex between methanol and carbon dioxide. These calculations explain the broadening of the 15  $\mu$m spectral feature observed in interstellar ices. This feature is assigned to the bending of C-O of the carbon dioxide and we confirm that the broadening is compatible with methanol interactions of the electron donor acceptor type. Extra interactions are also investigated and can be implied in the broadening.

Key words: molecular: spectroscopy infrared

Offprint request: A. Klotz, klotz@cesr.fr

© ESO 2004